Office chair



FIG. 1 is a front view of the office chair showing our new design;

FIG. 2 is a back view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a top perspective view thereof; and,

FIG. 8 is a bottom perspective view thereof.

The broken lines show portions of the article not claimed and form no part of the claimed design. 

CLAIM The ornamental design for an office chair, as shown and described. 